Wüstefeld, G.; Feikes, J.; Hatrott, M. v.; Ries, M. ; Hoehl, A.; Klein, R.; Müller, R.; Serdyukov, A.; Ulm, G.: Coherent THz Measurements at the Metrology Light Source. In: Proceedings IPAC 10. First International Particle Accelerator Conference, Kyoto, Japan, 23 - 28 May, 2010, 2010. - ISBN 978-92-9083-352-9, p. 2508-2510
http://accelconf.web.cern.ch/AccelConf/IPAC10/papers/wepea015.pdf
Abstract:
The Metrology Light Source (MLS) [1] is the first storage ring optimized for THz generation [2]. It applies a bunch shortening mode, based on a flexible momentum compaction factor ’_’ optics. The short bunches emit coherent THz radiation. We report on measured THz signals as a function of different machine parameters. Two type of measurements are presented in this paper. The first part presents THz bursting thresholds for a variety of ring parameters compared with theoretical predictions and similar results achieved at BESSY II. The second part discusses an example of a special machine tuning, where the coherent THz signal suddenly and unexpectedly vanishes. Some measurements are shown to demonstrate this effect, a physical explanation is missing.